From terminal, we see that there are 3 HDDs connected to server. They are “sdb”, “sdc” and “sdd”. Before we start to make new partition on our HDDs, we should decide what partition table we use. MBR or GPT? In my opinion, GPT is newer and supports over 2TB HDD. So, use “gdisk” command to manager partition.

use “?” to print out command. on the list, we see that “q” for exit without any changes. Sometimes, you operate wrong but you are not familiar with gdisk operation. Then, we just use “q” to exit gdisk program. It wouldn’t effect anythings to disk.

Now, we start to make new partition to disk. I decide 1.75TB for first partition and left for another one.

Command (? for help): n
Partition number (1-128, default 1): #leave it blank here
First sector (34-3907029134, default = 2048) or {+-}size{KMGTP}: #leave it blank here also
Last sector (2048-3907029134, default = 3907029134) or {+-}size{KMGTP}: 1750G
#####################################################################
#Beware of here!!I made 1750G for my first part so I fill in "1750G"#
#####################################################################
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): fd00
########################################################################
#if you want to learn more type, you can type "L" to show out. #
#But now we're gonna build up a RAID, so we type "fd00" for Linux RAID"#
#By default 8300, It's Linux file system #
########################################################################
Changed type of partition to 'Linux RAID'

Then, another other partition

Command (? for help): n
Partition number (2-128, default 2):
First sector (34-3907029134, default = 3670018048) or {+-}size{KMGTP}:
Last sector (3670018048-3907029134, default = 3907029134) or {+-}size{KMGTP}: #I leave it blank here this time because I would use whole space.
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): fd00
Changed type of partition to 'Linux RAID'